Final answer:
The correct nursing intervention when administering vasopressors to a client with a cardiac dysrhythmia is to monitor vital signs and cardiac rhythm. This is critical for assessing the medication's impact and the patient's safety.
Step-by-step explanation:
When administering prescribed vasopressors to a client with a cardiac dysrhythmia, the most appropriate nursing intervention is to monitor vital signs and cardiac rhythm. Vasopressors are potent medications that can significantly affect the cardiovascular system. They are used to increase blood pressure and improve heart function in critical situations, such as in the treatment of severe hypotension or shock. It is essential to document heart rate before and after administration to evaluate the drug's effectiveness and to monitor the patient's response to the medication. Other interventions, like keeping the client flat for one hour or administering every five minutes during cardiac resuscitation, are situation-dependent and not the primary nursing action for vasopressor therapy.